if_arp.h 1.8 KB

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  1. /* SPDX-License-Identifier: GPL-2.0-or-later */
  2. /*
  3. * INET An implementation of the TCP/IP protocol suite for the LINUX
  4. * operating system. INET is implemented using the BSD Socket
  5. * interface as the means of communication with the user level.
  6. *
  7. * Global definitions for the ARP (RFC 826) protocol.
  8. *
  9. * Version: @(#)if_arp.h 1.0.1 04/16/93
  10. *
  11. * Authors: Original taken from Berkeley UNIX 4.3, (c) UCB 1986-1988
  12. * Portions taken from the KA9Q/NOS (v2.00m PA0GRI) source.
  13. * Ross Biro
  14. * Fred N. van Kempen, <[email protected]>
  15. * Florian La Roche,
  16. * Jonathan Layes <[email protected]>
  17. * Arnaldo Carvalho de Melo <[email protected]> ARPHRD_HWX25
  18. */
  19. #ifndef _LINUX_IF_ARP_H
  20. #define _LINUX_IF_ARP_H
  21. #include <linux/skbuff.h>
  22. #include <uapi/linux/if_arp.h>
  23. static inline struct arphdr *arp_hdr(const struct sk_buff *skb)
  24. {
  25. return (struct arphdr *)skb_network_header(skb);
  26. }
  27. static inline unsigned int arp_hdr_len(const struct net_device *dev)
  28. {
  29. switch (dev->type) {
  30. #if IS_ENABLED(CONFIG_FIREWIRE_NET)
  31. case ARPHRD_IEEE1394:
  32. /* ARP header, device address and 2 IP addresses */
  33. return sizeof(struct arphdr) + dev->addr_len + sizeof(u32) * 2;
  34. #endif
  35. default:
  36. /* ARP header, plus 2 device addresses, plus 2 IP addresses. */
  37. return sizeof(struct arphdr) + (dev->addr_len + sizeof(u32)) * 2;
  38. }
  39. }
  40. static inline bool dev_is_mac_header_xmit(const struct net_device *dev)
  41. {
  42. switch (dev->type) {
  43. case ARPHRD_TUNNEL:
  44. case ARPHRD_TUNNEL6:
  45. case ARPHRD_SIT:
  46. case ARPHRD_IPGRE:
  47. case ARPHRD_IP6GRE:
  48. case ARPHRD_VOID:
  49. case ARPHRD_NONE:
  50. case ARPHRD_RAWIP:
  51. case ARPHRD_PIMREG:
  52. /* PPP adds its l2 header automatically in ppp_start_xmit().
  53. * This makes it look like an l3 device to __bpf_redirect() and tcf_mirred_init().
  54. */
  55. case ARPHRD_PPP:
  56. return false;
  57. default:
  58. return true;
  59. }
  60. }
  61. #endif /* _LINUX_IF_ARP_H */